Reddit mentions of Overcoming Depersonalization Disorder: A Mindfulness and Acceptance Guide to Conquering Feelings of Numbness and Unreality

As with most DP sufferers the constant pre-occupation with many philosophical questions is pretty normal. I go through the same kind of questions in my head and I thought I was the only one doing it. What if everything's in my head? Why does the universe exist? Does it actually exist? What is existence? How did it come into the first place? Am I me? This was just constant noise in the background.

I then got http://amzn.com/1572247061 and it lists pre-occupation with philosophical questions as one of the symptoms of DP/DR. It was a relief to see others also experience similar issues.

What you are doing is right. Accepting the condition and ignoring it subsequently is the method to overcome this disorder. Focusing on life activities such as work, gym, play, reading, creating, sleep will eventually make your brain to move on from its current pre-occupations.

It is initially very difficult, at least it was for me, but in the last few months I have made good progress. Keep calm and carry on (with Life).

P.S: And stop all intoxication, a glass of beer or wine is ok, but not more than that. And nothing else. I din't make the initial connection either. The mind needs to get it's balance back first.

More insight might be available on your symptoms if you describe:

the onset of this experience (i.e., all life? last year? after hospitalization? after hit to the head? etc.),

the duration (is this the case every day? does it last all day? does this problem wax and wane?),

the course (getting worse? static?)

the severity (how much does this impact your ability to appropriately function across domains - social, academic, work, family, etc.)

A differential might include both neurological and psychiatric conditions such as epilepsy, sleep deprivation, multiple sclerosis, lyme disease, anxiety, stress reactivity, or depersonalization disorder.

This type of presentation does not immediately make me think of a behavioral or neurological disorder, but that does not preclude it. Instead, it is more consistent with a psychological symptom termed depersonalization or dissociation. If you went to a psychologist or psychiatrist who conducted psychotherapy, he/she might take a mindfulness-based-cognitive-therapy or dialectical behavioral therapy approach, basically training your mind to 'ground' itself, until it becomes second nature enough to not require significant effort. (example article written for therapist 1 , example self-help text 2).

That being said, your experience is abnormal, and you should talk to your GP about exploring the potential etiologies.

Try this one?
Overcoming Depersonalization Disorder